User blog comment:Corbus/Castra Praetoria/@comment-3474228-20111213204327/@comment-4423064-20111213210047

OOC: Because this is a scuffle over who becomes emperor, and as such you can't destroy your capital. In addition to losing the palace and having to face up against the royal guard they would be wiping out the empire's greatest port and means of trade. It is much better for them to take out their enemy first.